Physics
Scientific paper
Apr 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000nimpa.444..423r&link_type=abstract
Nuclear Instruments and Methods in Physics Research Section A, Volume 444, Issue 1-2, p. 423-426.
Physics
2
Scientific paper
We are developing bolometer arrays for continuum detection in millimeter and submillimeter astronomy [1]. For the 2mm atmospheric window, where the transmission is comparatively high, a bolometer temperature of about 100mK is necessary in order to avoid being limited by the system noise. Our new 2mm array is cooled by a 3He/4He-dilution refrigerator with a base temperature of 30mK. The substrate for the 19 channel bolometer array consists of a single-crystal silicon wafer with silicon-nitride membranes. Radiation is collected by a single-mode horn array in front of the wafer and coupled into efficient absorbers in the center of the membranes. Resulting temperature changes of the absorbers are measured with NTD-germanium thermistors. In the first stage of the read out electronics, we use JFETs working at 150K. Cold RF-filters prevent RF interference from entering the bolometer array cavity. The combination of several mesh filters and a short piece of cylindrical waveguide at the end of each horn defines the bandpass for the incoming radiation, which is matched to the 2mm atmospheric window.
Esch Walter
Gemünd Hans-Peter
Gromke J. J.
Kreysa Ernst
Reichertz Lothar A.
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